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Decay of house-dust mite allergen Der f 1 at indoor climatic conditions
Kirsten E Sidenius1, Thorkil E Hallas, Jørgen Stenderup
1kirstensidenius@dadlnet.dk
Background:
The decay of house-dust mite allergens is important for the outcome of avoidance measures for house-dust mite-allergic patients.
Objective:
To quantify the stability of Der f 1 from mattress dust when exposed to domestic conditions.
Methods:
Three samples of mattress dust were individually homogenized and divided into 64 subsamples. Mites were killed by freezing for 48 hours at -30 degrees C. The subsamples were exposed in eight homes, three storerooms, and one greenhouse, where temperature and relative humidity were recorded. Der f 1 was determined in extracts of subsamples (enzyme-linked immunoadsorbent assay) at 0, 3, 12, and 24 months.
Results:
In the three samples of mattress dust, the initial concentrations of Der f 1 (mean +/- standard deviation; STD) were: 169 (12), 3.9 (0.4), and 31 (2.6) microg/g, respectively. Median half-life of Der f 1 in the mattress dust samples was 10 years in the exposure homes, 18 years in the store rooms, and 1.0 year in the greenhouse. No correlations among preserved Der f 1 and temperature, relative humidity, and absolute humidity in homes were found (Spearman rank correlation test).
Conclusion:
Natural decay of Der f 1, with an estimated half-life of 10 years at housing conditions, has no practical consequence in reducing allergen exposure. Therefore, avoidance measures should include an active removal of the allergens.
Insights
House dust mite allergen Der f 1 is highly stable under typical housing conditions, with a median half-life of 10 years. Natural decay is too slow to reduce exposure, necessitating active removal strategies for allergic patients.
Area of Science:
- Allergen stability and environmental exposure
- Immunology and Allergy Research
- Environmental Health Science
Background:
- House dust mite (HDM) allergens are significant triggers for allergic diseases.
- Understanding allergen decay is crucial for effective avoidance strategies in HDM-allergic individuals.
Purpose of the Study:
- To determine the stability and decay rate of Der f 1, a major HDM allergen, under various domestic environmental conditions.
- Quantify the half-life of Der f 1 in mattress dust samples exposed to real-world settings.
Main Methods:
- Mattress dust samples containing Der f 1 were collected and divided.
- Subsamples were exposed in homes, storerooms, and a greenhouse with continuous environmental monitoring (temperature, humidity).
- Der f 1 levels were quantified using ELISA at multiple time points up to 24 months.
Main Results:
- Initial Der f 1 concentrations varied across samples (169, 3.9, and 31 µg/g).
- The median half-life of Der f 1 was 10 years in homes, 18 years in storerooms, and 1 year in a greenhouse.
- No significant correlation was found between Der f 1 levels and measured environmental humidity or temperature.
Conclusions:
- Natural decay of Der f 1 under domestic conditions is very slow, with a 10-year half-life.
- This slow decay means natural processes do not significantly reduce allergen exposure.
- Effective management for HDM allergy requires active allergen removal, not just reliance on natural decay.
